title: Direct observation of large quantum interference effect in anthraquinone solid-state junctions.
abstract: Quantum interference in cross-conjugated molecules embedded in solid-state devices was investigated by direct current-voltage and differential conductance transport measurements of anthraquinone (AQ)-based large area planar junctions. A thin film of AQ was grafted covalently on the junction base electrode by diazonium electroreduction, while the counter electrode was directly evaporated on top of the molecular layer. Our technique provides direct evidence of a large quantum interference effect in multiple CMOS compatible planar junctions. The quantum interference is manifested by a pronounced dip in the differential conductance close to zero voltage bias. The experimental signature is well developed at low temperature (4 K), showing a large amplitude dip with a minimum >2 orders of magnitude lower than the conductance at higher bias and is still clearly evident at room temperature. A temperature analysis of the conductance curves revealed that electron-phonon coupling is the principal decoherence mechanism causing large conductance oscillations at low temperature.
authors.affiliation: Université Paris Diderot, Sorbonne Paris Cité, MPQ, UMR 7162 CNRS, 75205 Paris Cedex 13, France.
authors.forename: Vincent
authors.initials: V
authors.lastname: Rabache
authors.forename: Julien
authors.initials: J
authors.lastname: Chaste
authors.forename: Philippe
authors.initials: P
authors.lastname: Petit
authors.forename: Maria Luisa
authors.initials: ML
authors.lastname: Della Rocca
authors.forename: Pascal
authors.initials: P
authors.lastname: Martin
authors.forename: Jean-Christophe
authors.initials: JC
authors.lastname: Lacroix
authors.forename: Richard L
authors.initials: RL
authors.lastname: McCreery
authors.forename: Philippe
authors.initials: P
authors.lastname: Lafarge
mesh_terms: D000880:Anthraquinones / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D011789:Quantum Theory
chemical_list: D000880:Anthraquinones